Work-centering means



March 10, 1931 WORK CENTERING MEANS Original Filed Feb. 18, 1928 INVEN TOR. Ra Zfifi 6. J'r'yde ATTORNE 6,

R. E. HYDE 1,795,605

Patented Mar. 10, 1931 UNITED 1 STATES PATENT OFFICE I RALPH E. HYDE, OF CLEVELAND, OHIO, ASSIGNOR TO THE OSTER MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO WORK-CENTERING MEANS Original application filed February 18, 1928, Serial No. 255,287. Divided andthis application filed.

September 28, 1929.

The present invention relates, as indicated, to work centering means, and more particularly to means of that character intended for use in connection with a die stock. The present application is a division of my co-pending application Serial No. 255,287, filed February 18, 1928, for Die stocks.

It is an object of the present invention to provide a die stock of the character described having various improved features making for increased accuracy, safety and efiiciency in the use thereof. A further object is to provide a novel and peculiarly efficient work centering means in such a tool.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims, the annexed drawing and the following description setting forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing:

Fig. 1 is a transverse section through a die stock incorporating my work centering means; Fig. 2 is a rear elevation thereof; and Figs. 3 and 4 are detailed sectional views upon an enlarged scale.

Referring more particularly to the drawings, the reference numeral 1 indicates the back plate of a die stock, while the numeral 2 indicates the front plate thereof. Said back plate is formed with a bore 3 bounded by a rearwardly extending annular flange 4, and said front plate is formed with a correspond ing aperture 5. The dies 6 extend into said bore 5. The bore is slightly enlarged adjacent its outer end as at 7, and an annular groove 8 of considerably greater depth circumscribes said bore, forming an outstanding flange 9 between said enlarged bore 7 and said groove 8. A second narrower flange 10 forms the outer surface of said front plate 2.

J ournalled upon said flange 9, resting upon said flange 10, and provided with'cam elements 11 extending into said groove 8 and engaging said dies 6, there is a cam plate 11,

" the bore 12 of which snugly fits the external Serial No. 385,968.

diameter of said flange 9. Said bore 12 is slightly enlarged adjacent its outer end as at 13. A cam plate washer 14 is provided with an externally threaded cylindrical flange for engagement with the threads in the portion 7 of the bore 5, and with an annular flange 16 overlying the outer end of the flange 9 and entering the enlarged portion 13 of the bore 12 of the cam plate 11. The bore of said cam plate washer 14 has a diameter corresponding to that of the'bore 5. The cam plate washer 14 is locked in place by means of a pin 17 extending through an aperture in the flange 16' thereof and into an aperture in the flange 9.

Said cam plate 11 is provided with a laterally extending car 18 which carries a pin 20 cooperative with an operating'member 27 whereby the cam plate 11 may be oscillated; and it is to be understood that, as the cam plate ll is operated, the cam elements 11 cooperate with the dies 6 to move them radially in or out depending upon the direction of movement of the plate 11. The details of this operation are set out in full in myabove identified co-pending' application, and need not be moreparticularly discussed herein, as they form no part of the invention covered in the present application.

The back plate 1 and front plate 2 of the die stock are integrally connected by a pair of diametrically opposed relatively narrow webs 36 (only one of which is shown) such webs defining between them relatively large openings through which access may be had to work held in said die stock. A plurality (preferably three) of work centeringjaws 38 are reciprocably mounted in guide-ways 39 in said back plate 1, said jaws extending into the bore 3 thereof and being formed with teeth 40 for cooperation with the threads 41 of a scroll plate'42. Said scroll plate is journalled on the flange 4 and is provided with a handle 43 for convenience of operation. A relatively wide circumferential groove 44 is formed in said flange 4 adjacent the outer end thereof, and awasher 45 backs said scroll plate 42, said washer slightly overhanging said groove 44 as indicated at 46 in Fig. 4. 'A split spring ring 47 having'one end 48 thereof bent to enter an aperture 49 adjacent the periphery of said washer 15 retains said washer and said scroll plate 42 in position. As is clearly shown in Figs. 3 and 4:, said ring 47 is formed of stock having a cross-sectional diameter slightly less than that of the groove 4%. It will be seen that the described arrangement and construction of parts causes the ring 47 to exert a pressure toward the left as viewed in Figs. 1, 3 and 4 upon the washer l5 and the scroll plate 42. Such pressure is the resultant of the contractile tendency of the ring 4 7 operating against the concave side wall of the groove 44, the washer a5 being of such thickness as to prevent the ring 4 from reaching the bottom of the groove :1.

.Vhile the ope 'aticn of the device believed to be clea from the above description, a brief summary thereof may be given here. A piece of work tobe threaded is insert d through the bores, 5 and 15, and the the operator grasps the handle 43 to rotate the scroll plate 42. Rotation of said plate causes the teeth 40 of the jaws 38 to follow the spiral all of the scroll plate, wnereby said jaws 38 are uniformly set up toward the cen ter of the bor 3 to center the work in said here. The operator then rotates the whole stock with respect to the work to cut the desired threacdt being understood that the jaws are not clamped on the work, but merely engage the same lightly to effect a proper centering.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the followclaims or the equivalent of such stated means be employed.

1 therefore particularly point out and distinctly claim as my invention:

1, The combination with a die-stock having a cylindrical DiOjGCtlOR on its back plate, of work-centering jaws reciprocable in said st ch, a scroll plate for cooperation with said ja vs journalled on said projection, said pr jection being provided with a circumferential groove, a washer backing said scroll plate and partially overlying said groove, and a split str ng ring of less crosssectional dias meter than said groove entering said groove and bearing upon said washer.

2. The combination with a die-stock having a cylindrical projection on its back plate, of work-centering jaws reciprocable in said stock, a scroll plate for cooperation with said jaws journalled on said projection, said projection being provided with a circumferential groove, a washer having an aperture adjacent its periphery backing said scroll plate and partially overlying said groove, and

split spring ring of less cross-sectional diameter than said groove entering said groove and bearing upon said washer, one end of said ring being bent at right angles to the plane of said ring and entered in said washer aperture.

Signed by me this 26 day of September,

RALPH E. HYDE. 

